diff --git a/spec/common_log_handler_spec.cr b/spec/common_log_handler_spec.cr
new file mode 100644
index 0000000..840c79d
--- /dev/null
+++ b/spec/common_log_handler_spec.cr
@@ -0,0 +1,22 @@
+require "./spec_helper"
+
+describe "Kemal::CommonLogHandler" do
+  it "logs to the given IO" do
+    config = Kemal.config
+    io = MemoryIO.new
+    logger = Kemal::CommonLogHandler.new io
+    logger.write "Something"
+    io.to_s.should eq "Something"
+  end
+
+  it "creates log message for each request" do
+    request = HTTP::Request.new("GET", "/")
+    io = MemoryIO.new
+    context_io = MemoryIO.new
+    response = HTTP::Server::Response.new(context_io)
+    context = HTTP::Server::Context.new(request, response)
+    logger = Kemal::CommonLogHandler.new io
+    logger.call(context)
+    io.to_s.should_not be nil
+  end
+end
diff --git a/spec/logger_spec.cr b/spec/logger_spec.cr
deleted file mode 100644
index 20726f4..0000000
--- a/spec/logger_spec.cr
+++ /dev/null
@@ -1,14 +0,0 @@
-require "./spec_helper"
-
-describe "Kemal::LogHandler" do
-  it "creates a handler" do
-    logger = Kemal::CommonLogHandler.new
-    logger.handler.should_not be nil
-  end
-
-  it "creates a STDOUT handler by default" do
-    config = Kemal.config
-    logger = Kemal::CommonLogHandler.new
-    logger.handler.should be_a IO
-  end
-end
diff --git a/spec/spec_helper.cr b/spec/spec_helper.cr
index 3b04ff8..bbef162 100644
--- a/spec/spec_helper.cr
+++ b/spec/spec_helper.cr
@@ -9,7 +9,13 @@ class CustomTestHandler < HTTP::Handler
   end
 end
 
-class CustomLogHandler < Kemal::BaseLogHandler; end
+class CustomLogHandler < Kemal::BaseLogHandler
+  def call(context)
+  end
+
+  def write(message)
+  end
+end
 
 def create_request_and_return_io(handler, request)
   io = MemoryIO.new
diff --git a/src/kemal/base_log_handler.cr b/src/kemal/base_log_handler.cr
index d13f29c..05be9d0 100644
--- a/src/kemal/base_log_handler.cr
+++ b/src/kemal/base_log_handler.cr
@@ -1,14 +1,7 @@
 module Kemal
   # All loggers must inherit from `Kemal::BaseLogHandler`.
-  class Kemal::BaseLogHandler < HTTP::Handler
-    def initialize
-    end
-
-    def call(context)
-      call_next context
-    end
-
-    def write(message)
-    end
+  abstract class Kemal::BaseLogHandler < HTTP::Handler
+    abstract def call(context)
+    abstract def write(message)
   end
 end
diff --git a/src/kemal/common_log_handler.cr b/src/kemal/common_log_handler.cr
index 32fd097..016f844 100644
--- a/src/kemal/common_log_handler.cr
+++ b/src/kemal/common_log_handler.cr
@@ -1,10 +1,9 @@
 module Kemal
   class CommonLogHandler < Kemal::BaseLogHandler
-    @handler : IO::FileDescriptor
-    getter handler
+    @handler : IO
 
-    def initialize
-      @handler = STDOUT
+    def initialize(io : IO)
+      @handler = io
     end
 
     def call(context)
diff --git a/src/kemal/config.cr b/src/kemal/config.cr
index 4583cf4..1e8bc6f 100644
--- a/src/kemal/config.cr
+++ b/src/kemal/config.cr
@@ -74,7 +74,7 @@ module Kemal
 
     private def setup_log_handler
       @logger ||= if @logging
-                    Kemal::CommonLogHandler.new
+                    Kemal::CommonLogHandler.new(STDOUT)
                   else
                     Kemal::NullLogHandler.new
                   end
diff --git a/src/kemal/null_log_handler.cr b/src/kemal/null_log_handler.cr
index 0e4fb31..ca4d712 100644
--- a/src/kemal/null_log_handler.cr
+++ b/src/kemal/null_log_handler.cr
@@ -1,5 +1,10 @@
 module Kemal
   # This is here to represent the logger corresponding to Null Object Pattern.
   class NullLogHandler < Kemal::BaseLogHandler
+    def call(context)
+    end
+
+    def write(message)
+    end
   end
 end